Not so green (5)
I believe the answer is:
riper
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not so green</span>' is the definition.<br/ ><span class="explanation-format__explanation">('ripe' can be the opposite of 'green' so perhaps 'riper' is reasonable for 'not so green')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for riper that I've seen before include "More mature and ready to be eaten" , "On the way to getting mellow" , "More ready for harvest" , "More ready to pick" , "More ready for picking" .)